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한병기,박봉현(B.K.Han),B.H.Park 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
In this paper, the thick-walled rectangular tubes are analyzed to evaluate the bent-buckling loads by semi-theoretical approach. The effect of material nonlinearity is considered for the case of the buckling behavior of the thick-walled tubes. The buckling behavior by bending forces is more complicate than that one by axial compression. The stress distributions at the loading edges are not simple when bending stresses are applied. Therefore, the modification factor is adopted to calculate the maximum bending moments. Analytical and experimental results are compared and close agreement of the results are observed.
한병기,이성희,Han, B.K,Lee, S.H 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.12
In this study, free vibration analysis of double through-the-width split beam is studied based on the author's earlier work. Each segment which constructs double through-the-width split beam is considered as Timoshenko beam. The effect of coupling between longitudinal and transverse vibration on the natural frequencies of split beams is considered. Data acquisition and modal test of double split beam for clamped-free boundary condition are carried out. Experimental and numerical results obtained by ANSYS were compared with the calculated data by present theory and their comparisons give good agreement with one another. The influences of the size and location of double split, shear deformation, and boundary conditions on the natural frequencies are demonstrated for illustrative purpose. Effects of double split on the dynamic characteristics of beams can be used to detect the size and the location of damages in structures.
한병기(B.K.Han),안대식(D.S.An),박봉현(B.H.Park),이진혁(J.H.Lee) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
Sixty six dynamic tests on thin-walled square aluminum tubes having cross-sections with t/b=0.033 and various speeds were crushed axially on a rail type equipment.<br/> Approximate theoretical predictions were modified for the axial progressive crushing of<br/> square box columns using N. Johns's kinematically admissible method of analysis. This theoretical study predicts two deformation modes. New diagonal symmetric deformation mode were predicted theoretically and confirmed in the experimental tests. These diagonal symmetric mode cause an inclination of a column. The effective crushing distance is considered in the approximate theoretical analysis together with the influence of material strain rate sensitivity, which is important for steel but which is not important for aluminum. The simple equations presented herein for the design of axially crushed square box columns<br/> give reasonable agreement with the corresponding experimental results.<br/>